Method for operating an electrified drive train for a working machine, electrified drive train for a working machine and working machine

Abstract

A method for operating an electrified drive train, the drivetrain including a driving coupling of an electric motor to at least one wheel of a working machine, the method including generating an acceleration torque by the electric motor, the acceleration torque leading to an increase in speed of the at least one wheel, generating a braking torque, the braking torque leading to a reduction in speed of the at least one wheel, generating a second acceleration torque by the at least one wheel, the second acceleration torque leading to an increase in a speed of the electric motor, and generating a second braking torque by the at least one wheel, the second braking torque leading to a reduction in the speed of the electric motor, wherein, during a regenerative operation of the electric motor, an unwanted acceleration of the working machine is counteracted by an automated additional braking intervention.

The invention claimed is: 
     
       1. A method for operating an electrified drive train for a working machine, wherein the drivetrain comprises a driving coupling of an electric motor of the drive train to at least one wheel of the working machine, the method comprising:
 generating an acceleration torque by the electric motor, the acceleration torque leading to an increase in speed of the at least one wheel; 
 generating a braking torque by the electric motor, the braking torque leading to a reduction in speed of the at least one wheel; 
 generating a second acceleration torque by the at least one wheel, the second acceleration torque leading to an increase in a speed of the electric motor; and 
 generating a second braking torque by the at least one wheel, the second braking torque leading to a reduction in the speed of the electric motor, 
 wherein, during a regenerative operation of the electric motor, an unwanted acceleration of the working machine is counteracted by an automated additional braking intervention. 
 
     
     
       2. The method as claimed in  claim 1 ,
 wherein the additional braking intervention compensates the unwanted acceleration precisely. 
 
     
     
       3. The method as claimed in  claim 1 ,
 wherein the additional braking intervention reduces a driving speed of the working machine to the extent that, as a result of the regenerative operation alone, an unwanted acceleration no longer occurs. 
 
     
     
       4. The method as claimed in  claim 3 , wherein the additional braking intervention is only implemented if the driving speed of the working machine has exceeded a speed threshold value. 
     
     
       5. The method as claimed in  claim 1 ,
 wherein the unwanted acceleration is identified by simultaneously monitoring a setting device for specifying the speed of the electric motor and a driving speed of the working machine and establishing their relationship. 
 
     
     
       6. An electrified drive train for a working machine, comprising:
 an electric motor; and 
 at least one drive wheel, wherein the electric motor and the at least one drive wheel are drivingly coupled such that: 
 an acceleration torque generated by the electric motor leads to an increase in speed of the at least one wheel, 
 a braking torque generated by the electric motor leads to a reduction in speed of the at least one wheel, 
 an acceleration torque generated by the at least one wheel leads to an increase in speed of the electric motor and 
 a braking torque generated by the at least one wheel leads to a reduction in speed of the electric motor, 
 wherein the drive train is configured to identify an unwanted acceleration of the working machine during a regenerative operation of the electric motor, and 
 wherein the drive train is further configured to carry out an automated additional braking intervention. 
 
     
     
       7. The drive train as claimed in  claim 6 ,
 wherein the drive train further comprises an inclination sensor configured to identify a gradient of an incline. 
 
     
     
       8. The drive train as claimed in  claim 6 ,
 wherein the drive train further comprises a satellite navigation system configured to identify an incline. 
 
     
     
       9. The drive train as claimed in  claim 6 ,
 wherein the drive train further comprises fill-level sensors of fluid containers of the working machine configured to identify an incline. 
 
     
     
       10. The drive train as claimed in  claim 6 ,
 wherein the drive train comprises a friction brake configured to carry out the automated additional braking intervention. 
 
     
     
       11. The drive train as claimed in  claim 10 ,
 wherein the friction brake is configured as a negative parking brake, as a spring-loaded and hydraulically releasable brake or as an eddy-current brake. 
 
     
     
       12. The drive train as claimed in  claim 6 , wherein the drive train is configured to implement a method for operating an electrified drive train for a working machine, the method comprising:
 generating an acceleration torque by the electric motor, the acceleration torque leading to an increase in speed of the at least one wheel; 
 generating a braking torque by the electric motor, the braking torque leading to a reduction in speed of the at least one wheel; 
 generating a second acceleration torque by the at least one wheel, the second acceleration torque leading to an increase in a speed of the electric motor; and 
 generating a second braking torque by the at least one wheel, the second braking torque leading to a reduction in the speed of the electric motor, 
 wherein, during a regenerative operation of the electric motor, an unwanted acceleration of the working machine is counteracted by an automated additional braking intervention. 
 
     
     
       13. A working machine comprising a drive train as claimed in  claim 6 .